The central aim of this protocol is to determine if the omega-3 fatty acids eicosapentaenoic acid (EPA) and docosahexaenoic and (DHA) reduce aggressive behaviors among alcoholics in a randomized, double blind, placebo controlled trial. Aggression will be measured in a well-established behavioral test, the Point Subtraction Aggression Paradigm. Secondary and tertiary aims are to determine if supplementation will improve neurochemical mechanisms and cardiovascular abnormalities that are linked to the pathophysiology of aggression. A testing battery will be done before supplementation (baseline) and compared to the same battery repeated after three months of supplementation. This battery will include 1) psychometric measures (aggression, depression and impulsivity), 2) a neurochemical measure (a lumbar puncture for assessment of cerebrospinal fluid 5-hydroxyindolacetic acid [CSF 5-HIAA], a metabolite of serotonin), and 3) a measure of cardiovascular physiology (heart rate variability). The research participants will be randomized to consume four 1-gram capsules/ d containing either 1.88 grams of DHA plus EPA (active) or reference oils containing corn oil and 1% fish oil for flavor blinding (placebo). Research participants will be aggressive recovering alcoholics defined as scoring 20 or more on the Coccaro Lifetime History of Aggression Scale and who eat seafood no more than once per week. If these inexpensive nutrients reduce aggression or the related neurochemical and cardiovascular measures, these findings will be readily applicable to many aggressive populations.